2 .\"O sha1sum \- compute and check SHA1 message digest
3 sha1sum \- SHA1 メッセージダイジェストの計算と照合を行う
5 .\" Add any additional description here
7 .\"O+ Do not use the SHA-1 algorithm for security related purposes.
8 .\"O+ Instead, use an SHA\-2 algorithm, implemented in the programs
9 .\"O+ sha224sum(1), sha256sum(1), sha384sum(1), sha512sum(1),
10 .\"O+ or the BLAKE2 algorithm, implemented in b2sum(1)